I know MySQL limits auto_increment columns to primary keys. Why is this? My first thought is that it's a performance restriction, since there probably is some counter table somewhere that must be ...
I have a table that contains several keys into other tables (where each key is comprised of multiple columns). I would like to create a new column for each key that would be an integer such that ...
I have started to learn pgAdmin III to manage a PostgreSQL database. But it wasn't an easy to use application. If I create or have created a table with pgAdmin III, how can I add ...